A liquid discharge apparatus uses a drive signal including a micro-vibration waveform which causes the piezoelectric element to micro-vibrate such that an ink is not discharged from the nozzle in a case of being applied to the piezoelectric element as the drive signal and a drive waveform which deforms piezoelectric element such that the ink is discharged from the nozzle in a case of being applied to the piezoelectric element as the drive signal. The presentation unit selectably presents the indirect information from which the ink discharge status can be estimated such as the types of ink and the usage status of the ink or the like. The control unit changes the strength of the micro-vibration caused by the micro-vibration waveform based on the indirect information selected on the presentation unit.

An inkjet head includes an actuator that deforms in response to a drive signal from a drive circuit to change a volume of a pressure chamber to eject ink from a nozzle connected to the pressure chamber. The drive signal includes a main interval during which the ink is ejected and an auxiliary interval during which the ink is not ejected. The main interval includes a first pulse applying a first voltage, a first period maintaining the reference potential, and a second pulse applying a second voltage having a polarity opposite from the first voltage. The auxiliary interval is prior to the main interval and includes a third pulse applying a third voltage having the same polarity as the first voltage and a second period maintaining the reference potential.

A liquid ejecting apparatus includes a drive element, and a drive circuit that outputs a drive signal that drives the drive element. The drive circuit includes an integrated circuit that outputs an amplification control signal, an amplifier circuit that output an amplified modulation signal, and a demodulation circuit that output the drive signal. The integrated circuit includes a modulation circuit that modulates the base drive signal to output a modulation signal, a discharge circuit that discharges a charge based on the drive signal, a constant voltage output circuit that outputs a DC voltage signal, and an output terminal from which the DC voltage signal is output. The constant voltage output circuit and the discharge circuit are electrically coupled to the output terminal, and a shortest distance between the output terminal and the constant voltage output circuit is shorter than a shortest distance between the output terminal and the discharge circuit.

A liquid discharge apparatus includes a drive waveform generator configured to generate a common drive waveform including, in one cycle, a first period having a discharge waveform including a first element for changing a potential from a first potential to a second potential and a second element for changing a potential from the second potential to a third potential, and a second period having a first potential change waveform for decreasing deformation of the piezoelectric device as compared to deformation of the piezoelectric device when the first potential is supplied, and a waveform selector configured to supply the discharge waveform to the piezoelectric device in the first discharge section that discharges the liquid, and supply the first potential change waveform to the piezoelectric device in the second discharge section that does not discharge the liquid.

A digital printing system (10) includes a print head (622) and a processor (20). The print head is configured to jet droplets of ink. The processor is further configured to translate a required shade of a color, to be printed at a given location on a substrate by tire print head, into a sequence of pulses (625, 630), the sequence including: (a) up to a predefined maximum number of driving pulses (625) that cause the print head to jet respective droplets, and (b) a tickling pulse (630), which has a smaller amplitude than the driving pulses and which causes the print head to jet a droplet smaller than the droplets jetted in response to the driving pulses. The processor is additionally configured to apply the sequence of pulses to the print head.

A print head includes ejecting portions ejecting liquid by being supplied with a high voltage signal, a switch group switching between whether or not to supply the high voltage signal to the first ejecting portion group in accordance with a low voltage logic signal, a memory, a high voltage signal input terminal, and a low voltage logic signal input terminal, the print head having a first mode in which the print head executes reading processing of reading information stored in the memory and does not execute ejection control processing of controlling whether or not to supply the high voltage signal to the first ejecting portion group by switching the switch group in accordance with an input signal input from the low voltage logic signal input terminal and a second mode in which the print head does not execute the reading processing and executes the ejection control processing.

A liquid ejecting apparatus includes a head unit, the head unit includes an integrated circuit and an ejector, the integrated circuit includes a drive signal input terminal that inputs a first drive signal, a residual vibration signal output terminal that outputs a residual vibration signal, a differential signal receiving circuit that converts a pair of differential signals into a control signal and outputs the control signal, a drive signal selection circuit that outputs a second drive signal based on the control signal and the first drive signal, a drive signal output terminal that outputs the second drive signal to the ejector, a residual vibration signal output circuit that outputs a residual vibration signal, and a low-frequency circuit having a lower switching frequency than that of the residual vibration signal output circuit, and the low-frequency circuit is located between the differential signal receiving circuit and the residual vibration signal output circuit.

A liquid discharging apparatus has: a liquid discharging head that has a driving element and a pressure chamber in which liquid is pressurized when the driving element is driven; a driving circuit that drives the driving element; a detection circuit that detects a signal related to residual vibration in the pressure chamber; and a control section that controls a filling operation to supply liquid from the outside into the liquid discharging head. The control section terminates the filling operation according to a signal detected by the detection circuit after the driving element is driven by the driving circuit.

A liquid discharge head control circuit that includes a conversion circuit that converts a base diagnosis signal being a base of a first diagnosis signal into a pair of first differential signals, a first wiring, a second wiring for propagating a second reference voltage signal to be supplied to a restoration circuit, a third wiring for propagating the second reference voltage signal to be supplied to the restoration circuit, a fourth wiring for propagating one signal of a pair of first differential signals, and a fifth wiring for propagating the other signal of a pair of first differential signals. The fourth wiring and the second wiring are located to be adjacent to each other, the fifth wiring and the third wiring are located to be adjacent to each other, and the fourth wiring and the fifth wiring are located between the second wiring and the third wiring.

There is provided a liquid discharge apparatus including: an amplifier circuit that outputs an amplified modulated signal by driving a transistor; a demodulation circuit that includes an inductance element and outputs the driving signal, in which the inductance element includes a first side portion provided with a first terminal, a second side portion positioned facing the first side portion and provided with the second terminal, a third side portion intersecting with the first side portion and the second side portion, a lead member coupled to the first terminal and the second terminal, and a shortest distance between the transistor and the third side portion is equal to or shorter than a shortest distance between the transistor and the first side portion, and is equal to or shorter than a shortest distance between the transistor and the second side portion.